Permochoristinae Tillyard 1917

Subfamily PERMOCHORISTINAE Tillyard, 1917 (Fig. 2) Referred material GXIII-SETI02-025 imprint of fragmentary forewing, with basal part missing. Locality Lower part of the Section Peak Formation (Upper Triassic), northern Eisenhower Range, northern Victoria Land, East Antarctica (74 º 14’50"S, 162 º 28’47"E; Fig. 1). Description The forewing is very small (with a preserved length of only 8.2 mm), sub-oval in shape and completely flattened; the membrane appears rather soft and without distinct corrugation or sculpture (Fig. 2). The basal and apical regions are not preserved, and the basal connections of the main veins are not preserved. The anterior margin is slightly convex, with a long concave course at the distal end of R 1. The venation is strongly reduced, with only few, vaguely visible cross-veins. The Sc is short, very slightly sigmoidal and ending in the anterior margin far proximally from the midwing. The pterostigma (pt) is partially visible, in coloured pigment, and is nearly lanceolate and elongate. R 1 is long and straight, ending in the proximal third of the concave course of the anterior margin. Rs and M bifurcate at the same level. Rs is basally bifurcate at the level of the distal end of ScP, with five terminal branches (Rs 1 (bifurcated), Rs 2, Rs 3 and Rs 4) running parallel to each other and reaching the apical margin, with an additional short fork on Rs 1. Rs 1+2 is forked apical of the Rs 3+4 fork. Stem M is long, straight and divided into two main branches (MP 1+2 and MP 3+4) at the same level as the forking of Rs. M is five-branched (with additional forks on M 4). M 1+2 is forked distal of the bifurcation of Rs 1+2. CuA remains visible. There is a distinctive stained colour pattern in the forewing.